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10.7
Port A
10.7.1
Overview
Port A is a 6-bit I/O port. Port A pins also function as address bus outputs and SCI2 I/O pins
(SCK2, RxD2, and TxD2). The pin functions change according to the operating mode.
Port A has a built-in MOS input pull-up function that can be controlled by software.
Figure 10-6 shows the port A pin configuration.
Port A
Port A pins
PA3/A19/SCK2
PA2/A18/RxD2
PA1/A17/TxD2
PA0/A16
Figure 10-6 Port A Pin Functions
Pin functions in modes 4 to 6
PA3 (I/O) / A19 (output) / SCK2 (I/O)
PA2 (I/O) / A18 (output) / RxD2 (input)
PA1 (I/O) / A17 (output) / TxD2 (output)
PA0 (I/O) / A16 (output)
Pin functions in mode 7
PA3 (I/O) / SCK2 (output)
PA2 (I/O) / RxD2 (input)
PA1 (I/O) / TxD2 (output)
PA0 (I/O)
363
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